Filtering apparatus.



No. ?98,473. PATENTED AUG. 29, 1905. W. W. WILSON. FILTERING APPARATUS.

APPLIOATION FILED JUNE 7.1904.

/xx x u x 4o and in this class of filters I have found that UNITEDSTATES 'PATENT OFFICE.

WILLIAM W. WILSON, OF HOLYOKE, MA SSACHUSETTS.

FILTERING OAPPARATUS. i

Speefication of Letters Patent.

Patented Aug. 29, 1905.

Application filed June 7', 1904. Serial Ne. 211,&97.

Tr) (LZZ whom it may concern: v

Be it known that I, WILLIAM W. WILSON, a citizen of the United States ofAmerica, and a resident of Holyoke, in the county of Hampden and Stateof Massachusetts, have invented certain new and useful Improvements inFiltering Apparatus, of which the following is a full, clear, and exactdescription.

This invention relates to improvements in filtering apparatus orobedsavailable for the filtration of large quantities of waterto be used inpaper manufactories 'or otherwise where large quantities of clean waterare required.

The invention relates to the class of filtering apparatus of the generaldescription found in Letters Patent of the United States, granted to meApril 17, 1900, No. &17,780; and February 19, 1901, No. 668344, in whichthere are comprised a filtering receptacle or basin having a bed or bodyof filtering material, such as sand or sand combined with other suitablesubstance, a pipe or pipes having series of branches and through whichcurrents of water may be forced in an inward direction upwardlythroughout the entire filtering-bed, loosening or opening up the sandtherein, cleansing the sand, at the same time raising the water-levelabove the filter-bed, and all so arranged that the wash-water mayoverflow at one or more of the side walls of,

the receptacle to be carried away inor discharged from a receiver orcanal therefor and n this description of filtering apparatus and as'more particularly represented in .the

second above-named patent provision is made for the introduction fromthe bottom and upwardly through the filter-bed of currents of air whichare operable to increase the loosening or opening up of the filteringmaterial,

in the cleansi'ng operation using the reverse flow of wash-water orusing currents both of water and also. air concurrently therewith thefoul water forced and fiowing over the edges of the side Walls of thefilter receptacle or hasin into the receiving-canals therefor carriesWith it a considerable quantity of the sand in suspension therewith,resulting disadvantageously, in that 'replenishment in the filter-bed isrequired and also in that discharge-conduits for the wash-Water becomeliable to be choled up or clogged; and the object of this invention isto provide in a simple yet efiective manner means which withoutobstructing the freedom of clearance from' the filter-bed of thewash-water in the filtercleansing operation acts as a guard or break tointercept the sand which is in suspension in the wash-Water andmostespecially at and alongthe surface of the wall leading upwardly tothe overflow edge; and the invention con- ,desirable' andeflcientembodiment of 'the same in and as a part of the filteringapparatus is illustrated.

Figure 1 is a vertical cross-sectional View through a double filter-bedwith the provisions of this invention thereon. Fig. 2 is a plan view.The line l 1 onFig. 2 indicates 'the plane on'w'hich the section, Fig.1, is taken.

Similar characters of reference indicate corresponding parts in bothviews.

In the drawings, A A represent basins or filter-receptacles, of which B,are the beds of the filtering material, consisting of sand or layers ofgravel and sand or any other suitable comminuted material orcombinations of material having fitness to the purpose. In the 'bottomof each filtering-receptacle is a main 'water-pipe C, having amultiplcity of branches c, each provided with a series ofcollector-tubes 0 made suitably slitted or foraminous, as well known,the collector system in the ordinary working of the filter taking thefiltered Water which gravitates through the bedand delivering it throughthe main pipe for service.

In this"-class of filters it is common to have combined with thecollect'or system means for causing a reverse flowof clean watertherethrough effective to clea'nse-the filtering-body, and the level .ofthe Water' being raised above -the normal water-level in the basin suchWashwater, with the impurities carried therewith, will flow over theedges of the overfiow-walls a a of canals D r receivers for such refusefoul Water. The canals or receivers for the wash-Water are practicallylocated at the upper edges of one or more side walls of the filter-hasinand may be considered as parts of IOO Los

IIO

the side-wall constructions, either by being formed as channels-thereinmade in masonry,

as in my former patent first herein referr'ed to or by being constitutedof cast or sheet metal and mounted on the upper edges of the side walls,and again in some cases the overflowxwalls may, as represented in theright-hand department of Fig. 1, be the walls of a trough held Supportedat the suitable height for reoeiving the overfiow between the wallsproper of the basin, such being a desirable'provision in. unusually-widefilter-beds The overflow-walls, however constituted and whereverlocated,are' provided with sand-intercepting guards G, located suitably adjacent the 'upper edges of the overflow-walls, and while the particularform and arrangement of these guards may bequite Widely Varied apractical form is that shown in 'which the guards are represented in theform of long flat strips downwardly and inwardly inclined, the sameadvantageously being constituted by thin metallic strips or bars bent inthe form of an obtuse angle, one section thereof being placed againstand riveted to the side of the overflow-wall. y

In addition to the DTOVSOD/'OP the reverse flow of a wash-waterprovision is also commonly made for introducing inward and upwardlydirected currents of air through the filter-bed, the same opening up orloosening the sand and agitating it further than would be done by theWater-Currents, and J represents air-pip es with air-pipe brancheslocated in a lower portion ot' the filter-bed and' constituting the'medium' through which air under pressure and from a suitable source maybe carried and distributed in and through the bed; but this invention isnot limited to the provision of this particular means for theintroduction of the'air, nor, in fact, to any means therefor, as otherprovisions for the I result may be utilized or either the air or thewater Currents might not be simultaneously employed; but the action ofagitation and whatever may cause the aising of the waterlevel above thefilter-bed and the overflow thereof, tending to Carry more or less ofthe sand or fine filtering material therewith, ,will

be counteracted by the provision of the sand- 4 guards arranged foroperation substantially as described. These sand-guards 'have been foundeffective' and extremely useful in actual demonstration; the loss ofsand in overflow when they are used being inconside'rable.

In order that the air which is apt to form Currents of greatestintensity upwardly alongside the side walls of the-hasin leading to theoverflow edges of such walls may be relieved, the sand-guards Gr mayhave seriesof tubes m m carried thereby, said tubes at 'their lowerends'opening to the under side of the sand-- guards, while their upperend portions are projected above the Water-overflow level.

Having thus described my invention, What I claim; and desire to secureby Letters Patent, is

l. In a filtering apparatus, afiltering-receptacle having a body `offiltering material therein .and conduits thereunder for the introductionintothe reoeptacle of fluid 'currents for clearing and cleaning thefiltering material, an overfloW-Wall for said receptacle,

a sand intercepting guard strip projecting from the said Wall toward theinterior of the receptacle, said guard extending longitudinallythroughout the length of the wall, a plurality of upWardly-extending'pipo-sections carried by the guard-strip, said'.pipe-sections opening-both above and below the said gu rdstrip, and a trough-like canalarranged djacent to and'parallel with the-overflow-wall.

2. In a filtering apparatus; a ltering-receptacle having a body ofcomminuted filtering material therein, and conduits thereunder for' theintroduction into the .receptacle of fluid Currents for clearing andeleansing the filtering material, and' said receptacle having anoverfloW-wall provided near its upper .edge

